His mother, Marquita Campbell, said she feared the worst before seeing a doctor on Friday.

"He was burning hot," she said. "Like, I've never felt a baby that hot. He was lifeless. I could see he had issues breathing."

There are more than 150 other children suspected of having enterovirus at Boston Children's Hospital.

Twelve are reportedly in critical care, but Dr. Paul Biddinger, of Massachusetts General Hospital, said the majority of cases are relatively minor.

"People should know not to be afraid," he said.

Enterovirus infections in children with asthma are the exception.

"It can be a critical 911 situation, especially in children with asthma that have severe trouble breathing," Biddinger said. "So if your child has asthma, you should make sure they have an asthma treatment plan if they have severe trouble breathing absolutely call an ambulance."

Enterovirus D-68 is sweeping the country, however, there have been no confirmed cases of the virus in Massachusetts.

"By and large the ones that become the sickest are becoming particularly ill by breathing fast, breathing hard, wheezing," Boston Children's Hospital Dr. Michael Agus said.

Samples that have been tested at the state level will get confirmed by the Centers for Disease Control and Prevention.

Biddinger said the enterovirus outbreak should come to an end this fall. In the meantime, the four pediatric intensive care units in Boston are working together to prepare for the possibility of a surge in severe cases.